US4249108A - LaMg Aluminate phosphors activated by europium and lamps incorporating same - Google Patents
LaMg Aluminate phosphors activated by europium and lamps incorporating same Download PDFInfo
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- US4249108A US4249108A US06/099,064 US9906479A US4249108A US 4249108 A US4249108 A US 4249108A US 9906479 A US9906479 A US 9906479A US 4249108 A US4249108 A US 4249108A
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- 229910052693 Europium Inorganic materials 0.000 title claims description 7
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 title claims description 4
- 150000004645 aluminates Chemical class 0.000 title abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- -1 europium activated lanthanum magnesium aluminate Chemical class 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 claims description 4
- 229910052596 spinel Inorganic materials 0.000 claims description 4
- 239000011029 spinel Substances 0.000 claims description 4
- 239000012190 activator Substances 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 229910018404 Al2 O3 Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000295 emission spectrum Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910001679 gibbsite Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 1
- 229910017916 MgMn Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7792—Aluminates
Definitions
- This invention relates to aluminate phosphors, and more particularly relates to blue-emitting LaMg aluminate phosphors activated by europium, and to fluorescent lamps incorporating them.
- Beta-alumina-type hexagonal magnetoplumbite structure was discovered in the La 2 O 3 -Al 2 O 3 binary system for the compound LaAl 11 O 18 , and the compound was found to have a solid solution region for ratios of La 2 O 3 to Al 2 O 3 from about 1:10 to 1:12.
- R. S. Roth and S. Hasko J. American Ceramic Society, Vol. 41, (1958), p. 146. Fluorescence of La 2 O 3 .11Al 2 O 3 activated by Eu and Mn was published by M. Tamatani in 1974. (Japanese Journ. of App. Phys., Vol. 13, No. 6, June, 1974, p. 950-956).
- Verstegen et al. disclose luminescent ternary aluminates and gallates exhibiting a hexagonal crystal structure.
- the host compound LaMgAl 11 O 19 is disclosed as having the hexagonal or magneto plumbite structure and as falling within area "YSM" of the ternary diagram of FIG. 1 of the patent.
- Example No. 85 of the patent sets forth the composition
- compositions within the La 2 O 3 -MgO-Al 2 O 3 system although lying within a region of the composition diagram remote from the single phase magneto plumbite LaMgAl 11 O 19 and LaAl 11 O 18 compositions, nevertheless exhibit optimum brightnesses upon ultraviolet excitation.
- the compositions of the invention are comprised of at least two of the phases; magneto plumbite, alpha-alumina and spinel, and fall within the diamond shaped area DEFG of the ternary diagram for La 2 O 3 -MgO-Al 2 O 3 of FIG. 1.
- the blue-emitting phosphor compositions of the invention are useful either alone or in combination with one or more other phosphors in fluorescent lamps.
- FIG. 1 is a portion of the ternary diagram for La 2 O 3 -MgO-Al 2 O 3 , showing regions for prior art compositions and compositions of the invention having superior brightnesses upon ultraviolet excitation;
- FIG. 2 is a graph of relative intensity (arbitrary units) of luminescent emission versus wavelength of emission in nanometers for a composition of the invention.
- FIG. 3 is a plan view of a fluorescent lamp, partly cut away, showing a fluorescent layer incorporating a luminescent phosphor composition of the invention.
- region ABC labeled "Prior Art”
- region DEFG encompassing the multiphase Eu-activated host compositions of this invention, exhibiting improved brightness of UV-excited luminescent emission. Region DEFG may also be described by the formula
- the amount of Eu activator is not critical and may range from 2 to 20 mole %, or 0.02 to 0.20 moles per mole of host, but is preferably kept within the range 0.025 to 0.125 moles per mole of host.
- FIG. 2 is a portion of the emission spectrum of a composition of the invention (composition No. 2 of the Example), showing the emission peak.
- FIG. 3 is a plan view of a fluorescent lamp 10 of a conventional type, including glass envelope 11, end caps 12 and 14, with protruding connector pins 13a and b and 15a and b, a luminescent layer 16 coating the inside surface of the envelope 11.
- a fill gas comprising Ar and Hg atoms is present inside envelope 11.
- the layer 16 incorporates a Eu-activated luminescent composition from area DEFG of FIG. 1.
- compositions of the invention may be prepared readily by blending the required amounts of appropriate starting materials and firing in a reducing atmosphere at an elevated temperature for a modest time interval.
- Time, temperature and reducing atmosphere are not critical, but a mixture of nitrogen and hydrogen or hydrogen are preferred, a temperature range from 1500° C. to 1650° C. is preferred, and a time of from 1 to 5 hours is preferred.
- the particular starting materials are not critical. Preferred are Al(OH) 3 ,MgO, La 2 O 3 and Eu 2 O 3 .
- Example I Using the procedure of Example I, several phosphor samples were prepared having the compositions shown in Table I and FIG. 1. Phase assemblages obtained by x-ray diffraction analysis, along with relative brightnesses obtained by plaque measurements of phosphor powder excited with 254 nm radiation are also shown in the Table.
- the phosphor was incorporated into a standard commercial-type 40 watt fluorescent lamp. After 100 hours of lamp operation, the lamp showed 99.1% maintenance, where maintenance is defined by: ##EQU1##
- compositions 1, 2 and 3 of the invention exhibit relative brightnesses of 97, 100 and 98 percent, respectively, while prior art composition 4 exhibits only 95 percent relative brightness. It is also seen that compositions 1, 2 and 3 all contain the phases magneto plumbite and alpha alumina, and composition 3 additionally contains spinel. In contrast, the prior art composition 4 is entirely magneto plumbite.
- a blue emitting LaMg aluminate phosphor activated by Eu and having a multiphase structure exhibits improved brightness over prior art single phase compositions, and also exhibits high maintenance, making such phosphor useful either alone or in combination with other phosphors in fluorescent lamps.
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- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Luminescent Compositions (AREA)
Abstract
A blue emitting La Mg aluminate phosphor activated by Eu and having a multiphase structure, exhibits improved brightness over prior art single phase compositions, and also exhibits high maintenance, making such phosphor useful either alone or in combination with other phosphors in fluorescent lamps.
Description
This invention relates to aluminate phosphors, and more particularly relates to blue-emitting LaMg aluminate phosphors activated by europium, and to fluorescent lamps incorporating them.
The Beta-alumina-type hexagonal magnetoplumbite structure was discovered in the La2 O3 -Al2 O3 binary system for the compound LaAl11 O18, and the compound was found to have a solid solution region for ratios of La2 O3 to Al2 O3 from about 1:10 to 1:12. R. S. Roth and S. Hasko, J. American Ceramic Society, Vol. 41, (1958), p. 146. Fluorescence of La2 O3.11Al2 O3 activated by Eu and Mn was published by M. Tamatani in 1974. (Japanese Journ. of App. Phys., Vol. 13, No. 6, June, 1974, p. 950-956).
In U.S. patent application Ser. No. 509,438, assigned to the present assignee, R. W. Wolfe discloses luminescent mixed alkaline earth cation aluminates activated by Eu alone or with Mn, for example, Ba Mg aluminate activated by Eu.
In Netherlands Pat. No. 7,214,862, Verstegen et al. disclose luminescent ternary aluminates and gallates exhibiting a hexagonal crystal structure. The host compound LaMgAl11 O19 is disclosed as having the hexagonal or magneto plumbite structure and as falling within area "YSM" of the ternary diagram of FIG. 1 of the patent. Example No. 85 of the patent sets forth the composition
La.sub.0.93 Eu.sub.0.05 MgMn.sub.0.02 Al.sub.11 O.sub.19
having intensity maxima of luminescence at 452 and 515 nanometers.
In accordance with the invention, it has been discovered that certain blue-emitting Eu-activated phosphor compositions within the La2 O3 -MgO-Al2 O3 system, although lying within a region of the composition diagram remote from the single phase magneto plumbite LaMgAl11 O19 and LaAl11 O18 compositions, nevertheless exhibit optimum brightnesses upon ultraviolet excitation. The compositions of the invention are comprised of at least two of the phases; magneto plumbite, alpha-alumina and spinel, and fall within the diamond shaped area DEFG of the ternary diagram for La2 O3 -MgO-Al2 O3 of FIG. 1.
The blue-emitting phosphor compositions of the invention are useful either alone or in combination with one or more other phosphors in fluorescent lamps.
FIG. 1 is a portion of the ternary diagram for La2 O3 -MgO-Al2 O3, showing regions for prior art compositions and compositions of the invention having superior brightnesses upon ultraviolet excitation;
FIG. 2 is a graph of relative intensity (arbitrary units) of luminescent emission versus wavelength of emission in nanometers for a composition of the invention; and
FIG. 3 is a plan view of a fluorescent lamp, partly cut away, showing a fluorescent layer incorporating a luminescent phosphor composition of the invention.
Referring now to FIG. 1, which is a portion of a ternary diagram for the La2 O3 -MgO-Al2 O3 system, there is shown region ABC, labeled "Prior Art", corresponding to region YSM of FIG. 1 of the Verstegen patent discussed above and encompassing Eu-activated host compositions having a single phase hexagonal magnetoplumbite crystal structure. Also shown is region DEFG, encompassing the multiphase Eu-activated host compositions of this invention, exhibiting improved brightness of UV-excited luminescent emission. Region DEFG may also be described by the formula
La.sub.x Mg.sub.y Al.sub.11 O.sub.16.5+y+(3 x/2)
where
x=0.351 to 0.750 and
y=0.351 to 0.750
The amount of Eu activator is not critical and may range from 2 to 20 mole %, or 0.02 to 0.20 moles per mole of host, but is preferably kept within the range 0.025 to 0.125 moles per mole of host.
When activated with divalent Eu, the host compositions become brilliant blue phosphors, which upon UV excitation exhibit luminescent emissions peaking in intensity at about 445±5 nanometers with a peak intensity halfwidth of about 75±5 nanometers. FIG. 2 is a portion of the emission spectrum of a composition of the invention (composition No. 2 of the Example), showing the emission peak.
FIG. 3 is a plan view of a fluorescent lamp 10 of a conventional type, including glass envelope 11, end caps 12 and 14, with protruding connector pins 13a and b and 15a and b, a luminescent layer 16 coating the inside surface of the envelope 11. A fill gas comprising Ar and Hg atoms is present inside envelope 11. The layer 16 incorporates a Eu-activated luminescent composition from area DEFG of FIG. 1.
The compositions of the invention may be prepared readily by blending the required amounts of appropriate starting materials and firing in a reducing atmosphere at an elevated temperature for a modest time interval. Time, temperature and reducing atmosphere are not critical, but a mixture of nitrogen and hydrogen or hydrogen are preferred, a temperature range from 1500° C. to 1650° C. is preferred, and a time of from 1 to 5 hours is preferred. The particular starting materials are not critical. Preferred are Al(OH)3,MgO, La2 O3 and Eu2 O3.
A mixture of starting materials of
1.531 grams La2 O3
0.378 grams MgO
13.200 grams Al(OH)3
0.135 grams Eu2 O3
was fired at 1550° C. for four hours in a reducing atmosphere of 75 vol. % H2, 25 vol. % N2. The resulting phosphor had the approximate molar formulation:
La.sub.0.611 Mg.sub.0.611 Al.sub.11 O.sub.18.1 :0.05 Eu
and comprised about 80 percent magneto plumbite phase, 20 percent alpha alumina phase, and under UV excitation luminesced bright blue. A portion of the emission spectrum is shown in FIG. 2.
Using the procedure of Example I, several phosphor samples were prepared having the compositions shown in Table I and FIG. 1. Phase assemblages obtained by x-ray diffraction analysis, along with relative brightnesses obtained by plaque measurements of phosphor powder excited with 254 nm radiation are also shown in the Table.
Using the procedure of Example I, a phosphor composition was prepared having the approximate molar formulation:
La.sub.0.750 Mg.sub.0.750 Al.sub.11 O.sub.18.4
The phosphor was incorporated into a standard commercial-type 40 watt fluorescent lamp. After 100 hours of lamp operation, the lamp showed 99.1% maintenance, where maintenance is defined by: ##EQU1##
TABLE I
__________________________________________________________________________
Composition, Relative Brightness, and Phase Assemblages
For Points Shown in FIG. 1
Phase
No. In
Composition
(Mol %) Relative
Assemblage
FIG. 1
1/2La.sub.2 O.sub.3
MgO
1/2A1.sub.2 O.sub.3
Host Molar Formula
Brightness
(percent)*
__________________________________________________________________________
1 3.75
3.75
92.5
La.sub..445 Mg.sub..445 Al.sub.11 O.sub.17.6
97 65A, 35 a
2 5 5 90 La.sub..611 Mg.sub..611 Al.sub.11 O.sub.18.0
100 80A, 20 a
3 6.0 6.0
88.0
La.sub..750 Mg.sub..750 Al.sub.11 O.sub.18.5
98 85A, 5 a, 10S
4 7.69
7.69
85 LaMgAl.sub.11 O.sub.19
95 100A
__________________________________________________________________________
*Phases detected by xray diffraction. Relative amounts based on relative
peak heights and are approximate.
a = alpha alumina,
A = magneto plumbite,
S = spinel.
It may be seen from Table I and FIG. 1 that compositions 1, 2 and 3 of the invention exhibit relative brightnesses of 97, 100 and 98 percent, respectively, while prior art composition 4 exhibits only 95 percent relative brightness. It is also seen that compositions 1, 2 and 3 all contain the phases magneto plumbite and alpha alumina, and composition 3 additionally contains spinel. In contrast, the prior art composition 4 is entirely magneto plumbite.
While there has been shown and described what are at present considered the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined by the appended claims.
A blue emitting LaMg aluminate phosphor activated by Eu and having a multiphase structure, exhibits improved brightness over prior art single phase compositions, and also exhibits high maintenance, making such phosphor useful either alone or in combination with other phosphors in fluorescent lamps.
Claims (4)
1. A blue-emitting divalent europium activated lanthanum magnesium aluminate luminescent phosphor composition exhibiting a multiphase structure of either magneto plumbite and alpha alumina phases or magneto plumbite, alpha alumina and spinel phases and having the molar formula of
La.sub.x Mg.sub.y Al.sub.11 O.sub.16.5+y+( 3x/2)
where x lies between 0.351 and 0.750 and y lies between 0.351 and 0.750; said phosphor composition exhibiting a greater brightness than the corresponding divalent europium activated lanthanum magnesium aluminate luminescent phosphor composition having the molar formula LaMgA11 O19.
2. The composition of claim 1 wherein the europium activator is present in the amount of about 0.02 to 0.20 moles per mole of host.
3. The composition of claim 2 wherein the europium activator is present in the amount of from 0.025 to about 0.125 moles per mole of host.
4. A fluorescent lamp including the luminescent phosphor composition of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/099,064 US4249108A (en) | 1979-11-30 | 1979-11-30 | LaMg Aluminate phosphors activated by europium and lamps incorporating same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/099,064 US4249108A (en) | 1979-11-30 | 1979-11-30 | LaMg Aluminate phosphors activated by europium and lamps incorporating same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4249108A true US4249108A (en) | 1981-02-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/099,064 Expired - Lifetime US4249108A (en) | 1979-11-30 | 1979-11-30 | LaMg Aluminate phosphors activated by europium and lamps incorporating same |
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|---|---|
| US (1) | US4249108A (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606846A (en) * | 1980-07-08 | 1986-08-19 | Centre National De La Rechereche Scientifique | Mixed rare earth metal, divalent transition metal, aluminum oxide |
| US4915869A (en) * | 1985-10-21 | 1990-04-10 | Commissariat A L'energie Atomique | Mixed lanthanum-magnesium aluminates |
| US5105121A (en) * | 1989-02-16 | 1992-04-14 | Gte Laboratories Incorporated | Lanthanum cerium aluminate phosphor and an electrical discharge device containing the same |
| US5143438A (en) * | 1990-10-15 | 1992-09-01 | Thorn Emi Plc | Light sources |
| US5985174A (en) * | 1997-09-22 | 1999-11-16 | Samsung Display Devices | Fluorescent material used in an active dynamic liquid crystal display device and method for manufacturing the same |
| US6117362A (en) * | 1997-11-07 | 2000-09-12 | University Of Georgia Research Foundation, Inc. | Long-persistence blue phosphors |
| US20030059531A1 (en) * | 2001-09-26 | 2003-03-27 | Osram Sylvania Inc. | Protective spinel coating for aluminate phosphors |
| US6660186B2 (en) | 2001-10-31 | 2003-12-09 | Matsushita Electric Industrial Co., Ltd. | Method of making blue emitting aluminate phosphor for VUV excited light emitting device |
| US20040099844A1 (en) * | 2002-11-21 | 2004-05-27 | Matsushita Electric Industrial Co., Ltd. | Stable blue phosphor for plasma display panel applications |
| US20040164277A1 (en) * | 2003-02-25 | 2004-08-26 | Yen William M. | Long persistent phosphors and persistent energy transfer technique |
| US20060027786A1 (en) * | 2004-08-04 | 2006-02-09 | Intematix Corporation | Aluminate-based blue phosphors |
| US20060158090A1 (en) * | 2005-01-14 | 2006-07-20 | Intematix Corporation | Novel aluminate-based green phosphors |
| JP2008532896A (en) * | 2005-03-11 | 2008-08-21 | フォルシュングスツェントルム・ユーリッヒ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Insulating material and its manufacturing method and application |
| JP2008222989A (en) * | 2007-03-16 | 2008-09-25 | Nagoya Institute Of Technology | Phosphor mixture and method for producing the same |
| EP1888709A4 (en) * | 2005-03-30 | 2010-12-08 | Daejoo Electronic Mat Co Ltd | Lamp having good maintenance behavior of brightness and color coordinations |
| WO2011041657A1 (en) * | 2009-10-01 | 2011-04-07 | Cabot Corporation | Particulate compositions having plural responses to excitation radiation |
| CN116837461A (en) * | 2023-07-05 | 2023-10-03 | 国瑞科创稀土功能材料(赣州)有限公司 | A divalent europium ion-activated aluminate scintillation crystal and its preparation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7214862A (en) | 1972-11-03 | 1974-05-07 | ||
| US4161457A (en) * | 1977-03-15 | 1979-07-17 | Dai Nippon Toryo Co., Ltd. | Process for preparing a divalent europium activated alkaline earth metal aluminate phosphor |
-
1979
- 1979-11-30 US US06/099,064 patent/US4249108A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7214862A (en) | 1972-11-03 | 1974-05-07 | ||
| US4161457A (en) * | 1977-03-15 | 1979-07-17 | Dai Nippon Toryo Co., Ltd. | Process for preparing a divalent europium activated alkaline earth metal aluminate phosphor |
Non-Patent Citations (1)
| Title |
|---|
| Stevels et al., "J. Electrochem Soc.", vol. 123, No. 5, 1976, pp. 691-697. * |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606846A (en) * | 1980-07-08 | 1986-08-19 | Centre National De La Rechereche Scientifique | Mixed rare earth metal, divalent transition metal, aluminum oxide |
| US4915869A (en) * | 1985-10-21 | 1990-04-10 | Commissariat A L'energie Atomique | Mixed lanthanum-magnesium aluminates |
| US5105121A (en) * | 1989-02-16 | 1992-04-14 | Gte Laboratories Incorporated | Lanthanum cerium aluminate phosphor and an electrical discharge device containing the same |
| US5143438A (en) * | 1990-10-15 | 1992-09-01 | Thorn Emi Plc | Light sources |
| US5985174A (en) * | 1997-09-22 | 1999-11-16 | Samsung Display Devices | Fluorescent material used in an active dynamic liquid crystal display device and method for manufacturing the same |
| US6117362A (en) * | 1997-11-07 | 2000-09-12 | University Of Georgia Research Foundation, Inc. | Long-persistence blue phosphors |
| US20030059531A1 (en) * | 2001-09-26 | 2003-03-27 | Osram Sylvania Inc. | Protective spinel coating for aluminate phosphors |
| US6761971B2 (en) * | 2001-09-26 | 2004-07-13 | Osram Sylvania Inc. | Protective spinel coating for aluminate phosphors |
| US6660186B2 (en) | 2001-10-31 | 2003-12-09 | Matsushita Electric Industrial Co., Ltd. | Method of making blue emitting aluminate phosphor for VUV excited light emitting device |
| US6830706B2 (en) | 2002-11-21 | 2004-12-14 | Matsushita Electric Industrial Co., Ltd. | Stable blue phosphor for plasma display panel applications |
| US20040099844A1 (en) * | 2002-11-21 | 2004-05-27 | Matsushita Electric Industrial Co., Ltd. | Stable blue phosphor for plasma display panel applications |
| US20040164277A1 (en) * | 2003-02-25 | 2004-08-26 | Yen William M. | Long persistent phosphors and persistent energy transfer technique |
| US6953536B2 (en) | 2003-02-25 | 2005-10-11 | University Of Georgia Research Foundation, Inc. | Long persistent phosphors and persistent energy transfer technique |
| US20060027786A1 (en) * | 2004-08-04 | 2006-02-09 | Intematix Corporation | Aluminate-based blue phosphors |
| US7390437B2 (en) | 2004-08-04 | 2008-06-24 | Intematix Corporation | Aluminate-based blue phosphors |
| US20060158090A1 (en) * | 2005-01-14 | 2006-07-20 | Intematix Corporation | Novel aluminate-based green phosphors |
| JP2008532896A (en) * | 2005-03-11 | 2008-08-21 | フォルシュングスツェントルム・ユーリッヒ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Insulating material and its manufacturing method and application |
| EP1888709A4 (en) * | 2005-03-30 | 2010-12-08 | Daejoo Electronic Mat Co Ltd | Lamp having good maintenance behavior of brightness and color coordinations |
| JP2008222989A (en) * | 2007-03-16 | 2008-09-25 | Nagoya Institute Of Technology | Phosphor mixture and method for producing the same |
| WO2011041657A1 (en) * | 2009-10-01 | 2011-04-07 | Cabot Corporation | Particulate compositions having plural responses to excitation radiation |
| US8791439B2 (en) | 2009-10-01 | 2014-07-29 | Cabot Security Materials, Inc. | Particulate compositions having plural responses to excitation radiation |
| CN116837461A (en) * | 2023-07-05 | 2023-10-03 | 国瑞科创稀土功能材料(赣州)有限公司 | A divalent europium ion-activated aluminate scintillation crystal and its preparation method |
| CN116837461B (en) * | 2023-07-05 | 2024-02-06 | 国瑞科创稀土功能材料(赣州)有限公司 | A divalent europium ion-activated aluminate scintillation crystal and its preparation method |
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